Javascript gojs中悬停按钮的自定义样式

我使用下面的代码创建了一个按钮，当用户将鼠标悬停在图表节点上时显示该按钮。但是按钮看起来很正常，没有任何样式

我想让这个按钮类似于引导主按钮。如何将自定义css添加到此悬停按钮

---

我已经设法设计了如下按钮的样式

    $("Button", {
      alignment: go.Spot.Bottom,
      alignmentFocus: go.Spot.Left,
      "ButtonBorder.fill": "#007bff",
      "ButtonBorder.stroke": "#007bff",
      "_buttonFillOver": "#007bff",
      "_buttonStrokeOver": "#007bff",
      cursor: "pointer",
      width: 80,
      padding: go.Margin.parse('30 0 0 5')

    },
    $(go.TextBlock, "Analyse", {
      stroke: '#fff',
      margin: 2,
    }))

    $("Button", {
      alignment: go.Spot.Bottom,
      alignmentFocus: go.Spot.Left,
      "ButtonBorder.fill": "#007bff",
      "ButtonBorder.stroke": "#007bff",
      "_buttonFillOver": "#007bff",
      "_buttonStrokeOver": "#007bff",
      cursor: "pointer",
      width: 80,
      padding: go.Margin.parse('30 0 0 5')

    },
    $(go.TextBlock, "Analyse", {
      stroke: '#fff',
      margin: 2,
    }))

//Supplement two attributes:
$("Button", {
  alignment: go.Spot.Bottom,
  alignmentFocus: go.Spot.Left,
  "ButtonBorder.fill": "#007bff",
  "ButtonBorder.stroke": "#007bff",
  "_buttonFillOver": "#007bff",
  "_buttonStrokeOver": "#007bff",
  "_buttonFillPressed": '#3A8EE6',
  "_buttonStrokePressed": '#3A8EE6',
  cursor: "pointer",
  width: 80,
  padding: go.Margin.parse('30 0 0 5')
}